Mobile charging for electric vehicles

1. A method comprising: determining whether a mobile charge vehicle is within a target distance from an electric vehicle, wherein the electric vehicle comprises a first charge interface, and the mobile charge vehicle comprises a second charge interface; switching the electric vehicle into an autonomous driving mode when the mobile charge vehicle is determined to be within the target distance; controlling an articulating arm to engage the second charge interface with the first charge interface, wherein the controlling comprises: controlling, via a first joint, a first orientation and a first height of a first arm portion of the articulating arm, wherein a first end of the first arm portion is coupled with a front of the mobile charge vehicle via the first joint, and a second end of the first arm portion is coupled with a second joint; controlling, via the second joint, a second orientation and a second height of a second arm portion of the articulating arm, wherein a first end of the second arm portion is coupled with the second joint, and a second end of the second arm portion is coupled with a third joint; and controlling, via the third joint, a third orientation and a third height of a strut, wherein a first end of the strut is coupled with the third joint, and a second end of the strut is coupled with the second charge interface; and receiving energy from the mobile charge vehicle to charge a battery of the electric vehicle.

2. The method of claim 1 further including transmitting driving information from the electric vehicle to the mobile charge vehicle.

3. The method of claim 1 further including sending a request from the electric vehicle to receive a charge from the mobile charge vehicle.

4. The method of claim 1 further including monitoring a charge level of the battery while the energy is received.

5. The method of claim 4 further including sending an instruction from the electric vehicle to the mobile charge vehicle to disengage when the charge level meets a threshold level.

6. The method of claim 5 further including, after the mobile charge vehicle has disengaged, switching the electric vehicle to a manual driving mode.

7. The method of claim 1 , wherein the first charge interface includes an inductive receiver plate and the second charge interface includes an inductive transmitter plate, wherein the inductive receiver plate is angled downward toward ground, and the inductive transmitter plate is angled upward away from ground.

8. The method of claim 7 , wherein controlling the articulating arm to engage the second charge interface with the first charge interface includes positioning the inductive transmitter plate adjacent the inductive receiver plate without contacting the inductive receiver plate.

9. A system comprising: an electric vehicle comprising: a battery; a first charge interface for the battery disposed on an exterior surface of the electric vehicle; and a charge monitoring system to: determine when a mobile charge vehicle is within a first target distance from the electric vehicle; and switch the electric vehicle into an autonomous driving mode when the mobile charge vehicle is determined to be within the first target distance; the mobile charge vehicle comprising: a second charge interface; and an articulating arm comprising a first arm portion, a second arm portion, and a strut, wherein a first end of the first arm portion is coupled with a front of the mobile charge vehicle via a first joint, a second end of the first arm portion is coupled with a second joint, a first end of the second arm portion is coupled with the second joint, a second end of the second arm portion is coupled with a third joint, a first end of the strut is coupled with the third joint, and a second end of the strut is coupled with the second charge interface, and wherein the first joint, the second joint, and the third joint are configured to adjust an orientation and a height of each of the first arm portion, the second arm portion, and the strut.

10. The system of claim 9 , wherein the electric vehicle further includes an autonomous driving system to drive the electric vehicle in the autonomous driving mode, the autonomous driving system to control the electric vehicle to reduce a distance between the mobile charge vehicle and the electric vehicle to a second target distance smaller than the first target distance.

11. The system of claim 9 , wherein the electric vehicle further includes a communication system to transmit driving information to the mobile charge vehicle, the driving information including at least one of a speed of the electric vehicle, a direction of the electric vehicle, a road condition or a traffic condition.

12. The system of claim 11 , wherein the charge monitoring system is to monitor a charge level of the battery while energy is transferred from the mobile charge vehicle to the electric vehicle.

13. The system of claim 12 , wherein the communications system is to send an instruction to the mobile charge vehicle to disengage when the charge level meets a threshold level.

14. A method comprising: detecting when a mobile charge vehicle is within a first target distance from an electric vehicle, wherein the electric vehicle comprises a first charge interface, and the mobile charge vehicle comprises a second charge interface; switching the electric vehicle into an autonomous driving mode when the mobile charge vehicle is detected as being within the first target distance; controlling the electric vehicle to reduce a distance between the mobile charge vehicle and the electric vehicle to a second target distance smaller than the first target distance; and controlling an articulating arm to engage the second charge interface with the first charge interface when the mobile charge vehicle is within the second target distance, wherein the controlling comprises: controlling, via a first joint, a first orientation and a first height of a first arm portion of the articulating arm, wherein a first end of the first arm portion is coupled with a front of the mobile charge vehicle, and a second end of the first arm portion is coupled with a second joint; controlling, via the second joint, a second orientation and a second height of a second arm portion of the articulating arm, wherein a first end of the second arm portion is coupled with the second joint, and a second end of the second arm portion is coupled with a third joint; and controlling, via the third joint, a third orientation and a third height of a strut, wherein a first end of the strut is coupled with the third joint, and a second end of the strut is coupled with the second charge interface.

15. The method of claim 14 further including detecting when the mobile charge vehicle is within the second target distance.

16. The method of claim 15 further including receiving energy from the mobile charge vehicle to charge a battery of the electric vehicle when the mobile charge vehicle is within the second target distance.

17. The method of claim 14 , wherein controlling the articulating arm includes aligning the second charge interface with the first charge interface based on alignment data from a sensor carried by the articulating arm.

18. The method of claim 14 , wherein controlling the electric vehicle includes sending driving instructions from the electric vehicle to the mobile charge vehicle.